angularjs interpolate interr

Hello experts,

I have a function to load the items of the Webstore Cart.
And i use the same function to calculate the total amounts. I call the sub-function "$scope.getTotal" in 3 places in the same page. and i get like 22 times this error:

I don't know why i get all those errors!... i mean, the page renders ok and the getTotal function returns the correct values as well as the items when i use ng-repeat.. so why all these errors? How could to this better?

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